Foldable step stool



FIG. 1 is a front perspective view of a foldable step stool, showing my new design;

FIG. 2 is rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front perspective view of the foldable step stool in an open state;

FIG. 10 is a front perspective view of the foldable step stool in a folded state; and,

FIG. 11 is a partial enlarged view of FIG. 9 .

The broken lines in the figures are for the purposes of illustrating portions of the foldable step stool, which form no part of the claimed design. The additional long-dash broken lines encircling a portion of the foldable step stool in FIG. 9 and illustrated in FIG. 11 depict the boundaries of the enlarged view and form no part of the claimed design. 

CLAIM The ornamental design for a foldable step stool, as shown and described. 